Threat Advisory

DoS and DDoS Attack Threat Advisory

How to detect and stop DDoS attacks from the NTP AMP toolkit

As the security community scrambles to reduce the number of vulnerable NTP servers, attackers find ways to hit harder with fewer servers.

Fueled by the availability of new DDoS toolkits that make it simple from malicious actors to generate high-bandwidth, high-volume DDoS attacks against online targets, the NTP amplification attack method has surged in popularity.

With only a handful of vulnerable NTP servers, the current batch of NTP amplification attack toolkits enable malicious actors to launch 100 Gbps attacks – or larger. The most recent toolkit uses an NTP server’s own list of recent server connections – as many as 600 IP addresses – as the payload to create malicious traffic at the target site.

This DDoS threat advisory includes:

  • Indicators of the use of the NTP Amplification toolkit
  • Analysis of the source code
  • Use of monlist as the payload
  • The SNORT rule and target mitigation using ACL entries for attack targets
  • Mitigation instructions for vulnerable NTP servers
  • Statistics and payloads from two observed NTP Amplification DDoS attack campaigns

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